Phase retrieval is a promising method for in-situ metrology and has been applied to spherical mirror surface metrology
successfully. To meet the requirement of in-situ measurement in manufacturing large aperture parabolic mirror, a new
method using phase retrieval technology is developed. In this method, an approximately parallel beam is used to
illuminate the large parabolic mirror. The beam is produced by a point light source far away from the tested mirror.
Then, intensity of diffraction patterns near the focus is measured by CCD. The experiment of testing a parabolic mirror
with aperture 400mm and radius of curvature at vertex 2789.7mm is described. And some advices of improving the setup
are presented. Errors brought by the approximately parallel beam are compensated by an algorithm derived from GS
iterative algorithm. Phase retrieval result is consistent with that measured by interferometer sub-aperture stitching in
error distribution, PV value and RMS value. The experiment shows that this method features simple optical path, good
anti-vibration ability and acceptable accuracy.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.